The reason why Wei Jian can't return the reservation number may be that the time for canceling the reservation has passed. Generally speaking, it is necessary to cancel the reservation order within the specified time. If the appointment time is exceeded, the number cannot be returned. If it is difficult to return the number, it is recommended to contact Xiao Wei Health Customer Service for handling.
The above information is for reference only. You can consult the health workers in Xiao Wei for more comprehensive and accurate information.